3b+4b-7=21

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Solution for 3b+4b-7=21 equation: 


Simplifying
3b + 4b + -7 = 21

Reorder the terms:
-7 + 3b + 4b = 21

Combine like terms: 3b + 4b = 7b
-7 + 7b = 21

Solving
-7 + 7b = 21

Solving for variable 'b'.

Move all terms containing b to the left, all other terms to the right.

Add '7' to each side of the equation.
-7 + 7 + 7b = 21 + 7

Combine like terms: -7 + 7 = 0
0 + 7b = 21 + 7
7b = 21 + 7

Combine like terms: 21 + 7 = 28
7b = 28

Divide each side by '7'.
b = 4

Simplifying
b = 4

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